Bounds on rare decays of η and η′ mesons from the neutron EDM
| Parent link: | Physical Review D: covering particles, fields, gravitation, and cosmology Vol. 99, iss. 3.— 2019.— [031703(R), 6 p.] |
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| مؤلف مشترك: | |
| مؤلفون آخرون: | , , , , |
| الملخص: | Title screen We provide model-independent bounds on the rates of rare decays η(η′)→ππ based on experimental limits on the neutron electric dipole moment (nEDM). Starting from phenomenological η(η′)ππ couplings, the nEDM arises at the two-loop level. The leading-order relativistic chiral perturbation theory calculation with the minimal photon coupling to charged pions and a proton inside the loops leads to a finite, counterterm-free result. This is an improvement upon previous estimates which used approximations in evaluating the two-loop contribution and were plagued by divergences. While constraints on the η(η′)ππ couplings in our phenomenological approach are somewhat milder than in the picture with the QCD θ term, our calculation means that whatever the origin of these couplings, the decays η(η′)→2π will remain unobservable in the near future. Режим доступа: по договору с организацией-держателем ресурса |
| منشور في: |
2019
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| الموضوعات: | |
| الوصول للمادة أونلاين: | https://doi.org/10.1103/PhysRevD.99.031703 |
| التنسيق: | الكتروني فصل الكتاب |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=660821 |